Can't access old input and data is lost with Laravel

I have a form whose input values should be filled with the old values with Input::old():

{{ Form::open(['url' => '/directions', 'method' => 'get', 'class' => 'form-horizontal']) }}
    <div class="form-group">
        {{ Form::label('origin', 'Origin', ['class' => 'col-sm-2 control-label']) }}
        <div class="col-sm-10">
            {{ Form::text('origin', Input::get('origin'), ['class' => 'form-control', 'autocomplete' => 'off']) }}
        </div>
    </div>
    <div class="form-group">
        {{ Form::label('destination', 'Destination', ['class' => 'col-sm-2 control-label']) }}
        <div class="col-sm-10">
            {{ Form::text('destination', Input::get('destination'), ['class' => 'form-control', 'autocomplete' => 'off']) }}
        </div>
    </div>
    <div class="form-group">
        <div class="col-sm-10 col-sm-offset-2">
            {{ Form::submit('Buscar', ['class' => 'btn btn-default']) }}
        </div>
    </div>
{{ Form::close() }}

In the routes I created the view like this:

Route::get('/directions', function() {
    $origin = Input::get('origin');
    $destination = Input::get('destination');

    $url = "http://maps.googleapis.com/maps/api/directions/json?origin=" . $origin . "&destination=" . $destination . "&sensor=false";

    $json = json_decode(file_get_contents(str_replace(" ", "%20", $url)), true);
    $result = var_export($json, true);

    return View::make('home.index')->with('directions', $result);
});

However, it seemed like the old input values were not passed to the view, so I changed the last line with this:

return Redirect::to('/')->withInput()->with('directions', $result);

Now Input::old() keeps without getting the old input values, but Input::get() does. Also, the variable directions is detected as null in the view.

What am I doing wrong? Why aren't the values passed to the views?

If your last line is:

return Redirect::to('/')->withInput()->with('directions', $result);

then in your views you can have access to every input parameter using:

Input::old('parameter');

In order to get access to the passed directions you have to use Session:

{{ Session::get('directions') }}

If you don't like this and you want to use your very first choice:

return View::make('home.index')->with('directions', $result);

in order to have access to your inputs in your views, right before that add:

Input::flash(); or Input::flashOnly('origin', 'destination');

now in your views Input::old('origin') shall work as wanted.